TV doesn't seem to care about time sync much these days. It also depends
a lot on the path getting to you,
I get most of my TV via satellite (Dish network). The receiver I have
also can get OTA. I have happened to notice, once, that I had a local
channel on two TVs. One was receiving the
It is not that they don't care about time sync, it is that they
have to follow the rules of causality.
Because the whole digitization, broadcast, and display process
of digital TV processes seconds to minutes of material at a time,
You cannot make an event show at an exact time unless the event
On Thu, 01 Jan 2015 02:08:04 -0800
Rex r...@sonic.net wrote:
TV doesn't seem to care about time sync much these days. It also depends
a lot on the path getting to you,
Oh, they do. Just ask Magnus :-)
The thing is, that video delay in digital systems is hard to keep down
with all the
That delay might be intentional in case someone says something that has to
be bleeped out.
http://en.wikipedia.org/wiki/Broadcast_delay
Dave
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf
Of David J Taylor
Sent: Wednesday, December 31, 2014 23:23
Why not run the normal ntpd? Seems it would do what you want.
I don't see how a PPS source can NOT be supported. I'm talking about just
the 1Hz square wave signal, no serial data. Just like ntpd's type 22
clock. See this
http://www.eecis.udel.edu/~mills/ntp/html/drivers/driver22.html It
We have Brighthouse cable here in Central FL and the delay is horrendous. When
setting up the DVR recorder integrated in the cable box we have to adjust the
start and stop times -/+ 1 minute respectively on a regular basis. The delay is
less than a minute, but the adjustment resolution is 1
Hi
On Jan 1, 2015, at 12:39 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
We have DirecTV with some receivers standard
definition and others High Definition. The
delay is considerably greater on the HD version.
Even OTA HD is delayed considerably, as noted
if you try to
Hi
Here in central PA, ABC was almost exactly 10 seconds slow. That’s about 2
seconds longer than the delay in past years. Even with digital and a direct
network feed, there are a variable number of buffers in the chain.
Bob
On Jan 1, 2015, at 12:17 AM, Daniel Schultz n8...@usa.net wrote:
We have DirecTV with some receivers standard
definition and others High Definition. The
delay is considerably greater on the HD version.
Even OTA HD is delayed considerably, as noted
if you try to listen to a football game on the
radio while watching. Sometimes you hear touchdown
before the
Hi Magnus
Thanks for the detailed information.
btw, I've found an easier way to get histogram : sort tdc_test.txt |
uniq -c
2014-12-31 23:37 GMT+08:00 Magnus Danielson mag...@rubidium.dyndns.org:
Hi,
First I did a statistical histogram simply by counting how many times a
Hi,
Yes, that is a much quicker approach.
Bit of warning, I might have an error in the details of re-creating the
expected histogram, that was done in haste. I might have to correct that
eventually, but it shows the principle.
I also did not add plots of the histogram, estimated histogram
Modern Science at it's best ...
Some years ago, before the days of Digital TV, I used to compare an OTA
NFL broadcast of a certain game with the cable broadcast of the same game.
The difference was striking.
So, they improved things, now it's all lousy !!
73 es HNY, Dick, W1KSZ
On 1/1/2015
Chuck,
In digital times, the main reason for creating delays is due to the
temporal compression of MPEG-2 and MPEG-4. Production quality is either
not compressed or JPEG-2000 compressed. If you do not compress at all,
delay structure can be similar to that of analog video days. JPEG-2000
Hi Magnus,
I strongly suspect that the major cause of time lag in TV programs
seen on Digital over-the-air TV is in the TV sets themselves.
My evidence for this is observation of simulcast programs that are
broadcast in both HD and LD on different channels of the same
station. The HD always
I think if you re-install any normal OS out of the box it will have the
standard NTP included. Just get Ubuntu Linux then it will have ntpd
already setup.
Without PPS there is little point in having a GPS. These questions are
best asked in the NTP mailing list. http://lists.ntp.org/listinfo
Also, ever since the infamous Janet Jackson wardrobe malfunction almost all
live TV in the US is on a mandatory delay of several seconds so that offensive
(?) images and language can be censored.
I have a DTV-PAL over-the-air DVR box (made by Dish/Channelmaster, long since
discontinued).
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